For the purposes stated it seems a no-brainer to me that the .243 is the superior caliber. Little deer and varmints. Perfect. Barrel life? Well, that's a function of how hot you load it, how fast you shoot it and the quality of the steel it's made of.
I load 100 grain Hornady atop 40 grains of H4350. Smokin' hot but simple. Tune it down a little for the vermin. Yep, the .243 is the no-brainer choice in my view.
I like to keep it simple.
Conrad
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